Lithium sulfur battery cathode material and preparation method thereof

A positive electrode material, lithium-sulfur battery technology, applied in battery electrodes, secondary batteries, circuits, etc., can solve the problems of limiting battery life, reducing Coulombic efficiency, poor conductivity of active materials, etc., to prolong battery life and alleviate volume effect , the effect of maintaining Coulombic efficiency

Inactive Publication Date: 2019-02-22
江西烯牛石墨烯科技有限公司
View PDF7 Cites 6 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, there are still many challenges and defects to be solved in lithium-sulfur batteries: 1. The lithium polysulfide generated during the discharge process will break away from the current collector and enter the electrolyte, causing the active material to peel off from the conductive carrier, resulting in an increase in the internal resistance of the battery. During the process, some lithium polysulfides will be redoxed and deposited on the surface of the electrode, resulting in the loss of active materials; in addition, during charging, the long-chain lithium polysulfides will migrate to the negative electrode and react with lithium ions to form short-chain lithium polysulfides. A part will generate insulating Li 2 S 2 and lithium sulfide precipitation, the above process is repeated during the charging and discharging process, forming a shuttle effect and eventually causing the loss of active materials, reducing Coulombic efficiency and battery life
2. The conductivity of the active material is poor, and the sulfur and discharge product Li 2 S 2 It has poor conductivity with lithium sulfide, so it is necessary to add a conductive agent to increase the conductivity of the active material, thus reducing the

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Lithium sulfur battery cathode material and preparation method thereof
  • Lithium sulfur battery cathode material and preparation method thereof
  • Lithium sulfur battery cathode material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0061] The above-mentioned porous basic manganese oxide can be obtained by referring to the following preparation method, specifically, the method is a hydrothermal method, including the following steps:

[0062] (1) preparing 1% to 50% manganese salt aqueous solution, wherein the manganese salt is at least one of manganese nitrate, manganese sulfate, manganese chloride and manganese bromide;

[0063] (2) Optionally, add a small amount of alkaline solution to the manganese salt solution described in step (1), and stir to obtain mixture A;

[0064] (3) The manganese salt solution of step (1) or the mixture A of step (2) is subjected to a hydrothermal reaction at 120-220°C for 6-24h, and the product after the reaction is subjected to solid-liquid separation, and the obtained solid is Vacuum drying at 100°C yields porous basic manganese oxide.

[0065] Wherein, the manganese salt in step (1) is preferably manganese nitrate, and the alkaline solution of step (2) can be the aqueou...

Embodiment 1

[0101] Take 70ml of 20wt% manganese nitrate aqueous solution, add a few drops of ammonia water and stir evenly, transfer it into a 100ml hydrothermal reaction kettle, raise the temperature of the reaction system to 140°C under airtight conditions, and carry out hydrothermal reaction for 12h. After the reaction is complete, cool under natural conditions. The hydrothermal product was separated by suction filtration, washed several times with distilled water, and dried in vacuum at 70° C. for 12 hours to obtain porous basic manganese oxide in the form of light brown powder.

[0102] The porous basic manganese oxide prepared in this example 1 is subjected to morphology analysis, and the obtained spectrum is shown in Figure 1-3 .

[0103] figure 1 Shown is the X-ray diffraction (XRD) collection of illustrative plates (collection number MnOOH) of the porous basic manganese oxide prepared in this embodiment 1, and the present invention provides the XRD collection of porous basic m...

Embodiment 2

[0107] The porous basic manganese oxide material prepared in Example 1 was mixed with conductive carbon black and PVDF binder in a ratio of 8:1:1, scraped and coated on copper foil, and dried at 70°C to replace lithium metal As the negative electrode, the secondary electrolyte LB-114 was selected as the lithium ion electrolyte to test the performance of the lithium battery positive electrode material prepared by porous basic manganese oxide. The capacity decreased from 440mAh / g to 338mAh / g, and the specific capacity retention rate was 77%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Thicknessaaaaaaaaaa
Membrane resistanceaaaaaaaaaa
Diameteraaaaaaaaaa
Login to view more

Abstract

The invention relates to a lithium sulfur battery cathode material and a preparation method thereof and belongs to the technical field of lithium sulfur batteries. The lithium sulfur battery cathode material comprises a sulfur-containing active cathode material, a conductive additive, a binding agent and a sulfur carrier, wherein the sulfur carrier is porous basic manganese oxide, a graphene-basicmanganese oxide composite or a graphene-basic manganese oxide-cobalt sulfide composite. The sulfur carrier is good in conductivity and dispersibility, capable of favorably bonding with an intermediate product of sulfur and a lithium-sulfur battery, good in processability and easy to coat to form a lithium ion battery electrode. The synthesis method is simple in process operation, environment-friendly, free of calcination and low in energy consumption and has an industrialized prospect.

Description

technical field [0001] The invention belongs to the technical field of lithium-sulfur batteries, and in particular relates to a lithium-sulfur battery cathode material and a preparation method thereof. Background technique [0002] Lithium-sulfur batteries have a theoretical discharge specific capacity (1675mAh / g) and high energy density (2600Wh / kg), and are considered to be one of the most promising new batteries. The theoretical specific capacity of elemental sulfur to lithium is 1675mAh / g, the average discharge voltage of the battery is 2.2V, and the theoretical energy density of lithium-sulfur batteries reaches 2600Wh / kg, which is much higher than the theory of lithium-ion batteries such as lithium iron phosphate and ternary materials. Energy Density. In addition, sulfur is abundant in nature, and it is also an industrial by-product with low price. Sulfur is environmentally friendly and has obvious advantages. [0003] However, there are still many challenges and defec...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): H01M4/36H01M4/38H01M4/62H01M4/48H01M4/58H01M10/0525
CPCH01M4/362H01M4/38H01M4/48H01M4/582H01M4/624H01M10/0525Y02E60/10
Inventor 王俊中武泽林张燕纪敏余良光
Owner 江西烯牛石墨烯科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap